Adaptive optimal batch size

airbyte-integrations/connectors/destination-bigquery/src/main/java/io/airbyte/integrations/destination/bigquery/BigQueryAsyncStandardFlush.java

@@ -60,7 +60,7 @@ public long getOptimalBatchSizeBytes() {
     // resource the connector will usually at most fill up around 150 MB in a single queue. By lowering
     // the batch size, the AsyncFlusher will flush in smaller batches which allows for memory to be
     // freed earlier similar to a sliding window effect
-    return 175 * 1024 * 1024;
+    return Double.valueOf(Runtime.getRuntime().maxMemory() * 0.2).longValue();
   }
 
 }